The teams were level at 5-5 after two periods and 7-7 after three. Tom Curwen immediately edged Bridgefield in front before Ryan Padbury equalised for Birmingham. Curwen then hit the winner to make the final score 9-8, neither side managing a goal during the remaining five minutes.
The other promotion spot went to Cheltenham Spartans, who beat Castleford 15-12. Alex Hall scored six for Castleford, who drop out of BWPL next season along with Birmingham.